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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cecf7a7d1a98abb8d05cc6c693f637fc684a51e51915e5f82e7d26e63e6fc0ad' 
  AND token = 'D4Ub0zqc7HW9jjG41UvEdo1a0wFjnrehqRSsQGLpcOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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