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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7beb67c3357c1b255d58c6d4a66f336cd0330fc9266aa4a7bb0949b729055d6' 
  AND token = '83PVnFVdZvFZvr+kca9fjlq4CaaAoZvIt4sCj1fu6A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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