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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da55759f1d4df896dce203f490a59682f54010a5792dad26139758a2cb9ee327' 
  AND token = 'grfMjvu2Ga2tGSoOWIcMa73cHiIgmW1RhJa4JOVRjxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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