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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9dbe911da2bfcc3fd222fa1577ee8d1e08f8874158acb80ee7d3d45847d3e2' 
  AND token = '0/c6VGVQ7UJZlWpACFs3FDC6Cm08LyHNuiBjK6MAUwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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