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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bd5dce6ca3d90c4adcf45834c69a95b23725ed72ae0413b7730bf44f4a8868' 
  AND token = '3l/s37SscWzWKQNU+x7StRM2tJLQtvE95kECdEHKKZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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