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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9057b994f110d29ec42c3b3c613def56aea2c043cbd81e6cc0d99152d72baaf' 
  AND token = 'hQOfexpnxCST6iaXb5lN7XEw+LTTZ2gQNYuuxA29ewY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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