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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56854aaa9e504384e8e3f40e596b9d70c3e4344d87c2daf5d3fd0e38f1401c7' 
  AND token = '8nC3vppZTBNLIM9UJf2rdp3z/DVLyMb/R/6u8uiQdZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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