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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e148f7bfe4fbe54c141fdc8617f30b18ece60141457e13ed323d617b01edb981' 
  AND token = 'uAAiOygQhKEHXeob62K/GO1bXYOZwQ7ANu26A62C7GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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