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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d96c6d60bb6afb4fc6a739edd07f09be3d33d927dc02a52c8a07af790ae05c5' 
  AND token = 'LU6mKByH88UErsO6Mn0KhiS8EKPMG0DM+6cT/uL3ZWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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