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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8513232f682a217fb304d9fb67cd157aa74e62ddd007999c9e80f7c55f48b501' 
  AND token = 'Cu3CRpG4i6p11CUGMFiLFxbkRcJ6zVwmivlsCr4+nd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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