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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f90b1d297ec8c31b7fd3253a5eb03c597e1de95ebf82fbdf7d69af344054eda' 
  AND token = 'fa6ckxUE/lFG0ICL5KcfwOrpXZgFcRgO5DK4FncNxLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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