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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43711d676f46e988e7e21a767c77a3785ee4b93424f6b6411c4df0f7ac5d2154' 
  AND token = '+hni5pAXN2cizmYqPNqh4BUsVGjd72+86P47q1+5Xq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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