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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277410eabd2500287e740d00901026301637b03e2173e88fa1524d307689d227' 
  AND token = 'ZhdntEGfFjMX3Ky75uo17EL/Q05JG9Q+x1s/RmlYMBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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