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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e60708659c80d37c377ccaeb443128f941cb46db6c6719570c9e3f0272de56a' 
  AND token = 'OLA80laD3pffGY1JvwSqcDvx+Pt5Q8XwBaD+aIO0sKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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