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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c430926d15e694c6c9799e4f895cecaaee77c706d7ec6704df95812e98efe1d' 
  AND token = 'zoLaE5SjbE/SbBHjvgXliRmvK3HXMA8GcMRvxE49Ap4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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