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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5ac64e83c0ff891afa7f54f5b7590ce71231147eba33d383fe17c18d88a1e5' 
  AND token = 'Rq4W+ODU/rclmJ0sRXTszl+YwQL+AXpTbQMGB/DMO9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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