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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803a135270d19563490225bc5c82a830fde4a106cab54b01d6020912394e3425' 
  AND token = 'dEF4OxcKzNvw9LSE2149xJ8f1qkFGksW7ZndP9evkO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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