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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a7c1bbedd0badcf9ee9caad1644ceb7bda36954364b8de1ebeba0f3cb750db' 
  AND token = 'gQgAvn1TSHiWcDjyWiGrbJ7NNK8nlYRorgN5XPbB3fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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