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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1066fe8b67940bd74e5fe4360c69a8c4488b21c7a63b6e2b8f41c5267590e3db' 
  AND token = '2fNmRKmzH1SIMYlv3waYJnXO3HpsrBc82Hy0Q81lSFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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