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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e9ade7424ce1b4f1cfad6641451630a18ca0f6dfa452ed75d96398f4e8c301' 
  AND token = '7VWFKLNDr1JmQ7xbO5AjJXyFr504njj0Bfp+5ZsvsOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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