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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab097c3a45689a83516d86663a365122d9f4c852b9d0a461f88ad496c10a4d68' 
  AND token = 'pp7Tn50U5LbnjB5OyyjKvTwHATOh4/CvpC3oxYLbGAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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