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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a056f91ad3fcfdcaed314d72ecb5e75142b15ddc6aab970b7f6521314f0899' 
  AND token = 'KloVbWwtraAJ23ksmu/t1JZdUJ0GhrP7AXKWhX7wbzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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