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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d6663f38b09023bd558b3ff4f942988491243416347968d9b1ddb108ad4249' 
  AND token = 'pBktU4KHBqUstrEF7v0YYLA/b2+02TJj68NYqeNTLXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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