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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550db51063abc401a71f13af9eb6474c8b798f9b68d1b2dd8f1c087210f360d8' 
  AND token = 'DOBx14bzz8M0sO8EU66tmFANp43Yf9QW0d4j5HiCuYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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