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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94604b239ce14e139dafbe161a9fec363e3c1d2fbb369ee08c4919b3b9288aa8' 
  AND token = 'qr4Eqv0Mnpp+8E+AXl/K7jkdxF6Y1WHlK07vAsSyCxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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