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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3be755877dc532eaff83ed07a5bec153cfb722034fbd5fba018eec07fafd7e1' 
  AND token = '8z2ixLeRQkBQACsQIyqHoKV/4oFdOgfAEAvZjnF5zes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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