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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4002f1a8e8685e1a79f1ce6bd1c23e6316c8d2ac548f2e30ac35dc79802e6111' 
  AND token = 'pRsTQOeRGJc55vjoPNiG60kxUT1e1var1T9tlf2b62M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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