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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad5fbdb0276f5c0f339552ab624181efe72b83382d403ebc3bf6ac7d5080d8e' 
  AND token = '1bQFs9lRHy91ic3sv2kAQ5y9GqZtzlo1H7N8pyvyzEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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