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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934d621f618a1e01a5debdb7d5bf59777c953eeb18ee7f4dac973936667bf064' 
  AND token = 'wfp+ss3oSjK4aA3k7EyGZ/vUIA1pi01zB43MYv1r2Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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