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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c345e611f6f2495af983ce4c92b52d24bc9756fc657bcc0b5cba94acc14d0857' 
  AND token = 'NjPBRP8TqIYnMpTDuLljmJc2bIY2ofNNI0YiJKY4Qis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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