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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f827a1061ad2b1c762a6ac63def3043b194380bb37cbb06a9ac1b2fd198d608c' 
  AND token = 'fZhPU80btNVZtmfNfF0JbNsp2C15jj5/QMblD27gylU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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