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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3122b1c3f415928d1f45d81a8bc97c768b2688c0c5a82dd2236dc9e91d0c3f6a' 
  AND token = 'PkApCSht5SCklqaNXU8F9LwLoXnoN3fzTlElqKeWWOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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