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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f474e95ff8a35d44b9ffd9c1cd5a2e0c900584bd7bf91eef7b68bcfd4556d5' 
  AND token = 'ID119U/PuffdIsiVuVAvGYoJT6i2no0ZYov8sXvtIzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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