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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bd8a0e3cdf3299711a39a06e46a86784739d88933efd5d78341d6d4fa2d4a0' 
  AND token = 'K8RGRKHOkPzMJUB7k4yLec/gmoltumAD3eqQPKj+1cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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