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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c2e5490e8fa68b0729c27c2c6c93c833102f43decd04bb18fea808f9803c75' 
  AND token = '6v8CuFwgAixlWSMywd3iHoZNsWW0/xmQW650ROaAU/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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