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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b2f6a8989d1d3bfcd2bdeea97b0950e2f0741ac903b9bf35c3026fe8cfda33' 
  AND token = 'rqXb5f3KUIJMnkcxO3J53L4OYG3X86g+6Ky3dZqZ6k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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