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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999a8d97236edbe1b1a391d92fad5f804f2f6855acaf87262788b681732c5011' 
  AND token = 'dKh1ohEGnolQmTYt+Y6XZnrbmP0WAbAeRNilhrXhiQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}