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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa37a53c50417f419812b27e77fbba580a5ae80f8f78d600a26291515c43b78' 
  AND token = 'evc1MPmz0d1hjlkYh+H5tbVHHJ9oYzjhakPRZd7pQ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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