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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048948bc535f16475ea7ac8361ab7b0528c7ee62087ad00bfb5e0e822031bcaa' 
  AND token = 'wVavrxyIXKQ+eCHggF+3cT5n0tI/wLsJ8EJrpP8uJUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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