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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a50bbb52fea59dd61ab11da602b1193b816e1b22ec24009d52af13dbd39a65ce' 
  AND token = 'bLQyho+Uumglx16xk1IA/TbVtj3l9ZjPdkv4y95pJlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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