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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f6c474dd35426f566280ea1806ed09a2b8a28fe7a6c90827306e2fa3e45b86' 
  AND token = 'ZpUyeXFUBByxz7tbs5ZYZ6locZhBanDST49nU5alHGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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