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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32c8f6d5d9116b0295c1e6c687155f2534b41d8ecdd3ad06f1796e42651f150' 
  AND token = 'akH4JMV7leXF7CBZ5yS5kFUJYrPZaTyMHONezuul5mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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