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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d35dace5cfde946ceaf58e7ed015ef9ae240f7f8cc2f532e243a39057f1a3f8' 
  AND token = '/c7IuoKgKbDdVwhxYU0d2ien3Ee6u283I7W6iUFh3cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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