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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4402aab7fbc2def276a26ee096bf7cdeaab61574c60b190053773c251c1a6aa' 
  AND token = 'a2MaQDcH1WNnmrBs6Ta0OBkgDHs/Sz+4hM1stY4b1Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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