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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b71235f4965c241e389f012b26aec925bb9b81aac758dfba127cc6c87537ea7' 
  AND token = 'j2MUOA3Ejg+1cf7XP51ECkA9uhfBQRQYGUi2tLUJ6SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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