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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb4d439442a7e8254039b22a49861ba03a04324620b0c8335d0d20d0fe472e2' 
  AND token = 'QCKGwvN99jNpzq60pUVWDPF0yNbFrjSCYiy2yB00J/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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