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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82040f43a6c5735ccfd4064f3e74155047e5f8b6b3ccb1887c798ab3157fff9' 
  AND token = 'UFu7t834VVnzHnU9F+4a9KiSuHuQSTFqI0/BnGS0lP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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