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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276825c73c9ee99519e49c96ad6c8905500d2fa3984a985202d537f8a7758309' 
  AND token = 'OuspuUbtN7tbI5lKhhwaN/xObn/67WrRI/SVJ7/+Y28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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