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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84888fedf70da4a790fb22a39ed7991e1da774b2d39c2635969c09d22035009' 
  AND token = 'hCamETzbTwvpplwMaLCyGQGM+TRJE1XPwuul0Hzt1RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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