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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a25690e5b7ae0efff990cba857b3f07642a0ed22d9d73b3db0109a8f0fd133' 
  AND token = '8I9Lm65OQSpEolCiLR0utXjZoEpMlECP0NI3zYtv0S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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