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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba680dc3a44ffae9aaa11af458f5f2cc8b89ea5ada4069bb5aa95dac1990fc4f' 
  AND token = 'Va6nAEjtqTd6Wx3RpGsP5G+KWwHzUhJ7U9FC9N9fSe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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