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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44556372d7d729d5c922ee3a09cdc2ad56d3ac218c905c66044d4471fcada5d3' 
  AND token = 'FyqdjDeumpY4DShfAb9+yY6j0jHGvB8LLwZ5ToOFV9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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