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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb423ce78a1f9572910c888ae4f6124cebc1bc7295f990cf2e196cd35a15210' 
  AND token = '38RgTCYDF45uLzOktquVRxm12ljN5kSTuTyjOMy9C9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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