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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3cca7fceb57fbc162d5e6da652f2e2c519db9f733fc1af12cc8ac423bb5651' 
  AND token = '0ypi2xFf3htU7GZa9KJj4gOiomjXMCc1oRT3ze5N5wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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