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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75824ac734971463a5ccc1b5c2b3ceeb3e2c90187812c8a339d41a2dfb5fc42d' 
  AND token = 'ugu5s1oMPhgYzs7Z5+fQwDJeOSX8/mE/g4a4U+8H0hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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