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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417930c67322015aeca88db567f495efbdaff55169c5018a9f09fc3e553ffe6c' 
  AND token = 'ZtdlIX6ko8/HpemMr2WtksjBL0rbLYgZQPprCxp1wFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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