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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469df25812af37ff95c0f1d0986d38ffdb15d373b46af82e9a80b08d7e9d00e0' 
  AND token = 'bi4cohhRUILmVvJHmt3vG3Kfaxi2EUkVOtgJSJXMH7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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