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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be961a8f3352dd4e6bbf5e2e991de1aa7014f84f76b2c6b795fae24d9f7b13f5' 
  AND token = 'V6t/+6TCSuu4b4fhep+fzRDTQEnlH/ejc2BM7a6TKq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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