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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb0b4c308f84b2951595d353de20466889ed33523764cda2eeb650e19a98244' 
  AND token = 'zaelhNqVmkgOtAXxGe+gxkly0dGRbT0DB3tVAdQZRdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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