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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23638d8471ca0d9cc05900b074fde7b2d9f5077b3b4091151e9113d38652ef63' 
  AND token = '6zp/7k1rvh0/gclz1pJUCSgC26OB0IKBvruJ3zJSigo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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