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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f3ea9b29ef4a8b62aaf33ae42be85063a183654533b2952b0cf56ece4f8813' 
  AND token = 'vHj4kgK7xsuTaOe+IZVMx87m2vyx8fdzl9QimFfjkfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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